Changing content of Tab

General
1

Hi,

I have a TabSheet with 4 tabs.

One of the Tabs has a huge table with more than 50,000 rows. So I was wondering if I can load the tab only when it is selected.
I failed miserably using the code below.



tabs.addListener(new SelectedTabChangeListener() {
			@Override
			public void selectedTabChange(SelectedTabChangeEvent event) {
				
                                      if(event.getTabSheet().getSelectedTab().getCaption() == "selected tab") {
					
                                        //adding the table
					event.getTabSheet().setSelectedTab(newTableComponent);
					
                                        //repaint
                                        event.getTabSheet().getSelectedTab().requestRepaint();
					
				}
			}
			
		});

Thanks,
Deepak

2

Any component that you add to the layout will be processed immediately, but sent to the client only when visible. What you want here, I presume, is to build your table content when the user selects the tab.

The most easy solution would be to add the table to the Tab, but not adding any items. Just keep a reference to the table in your class somewhere. Then you can use the listener to call a fillTable() method that actually fetches the data, adds the items to the table and initializes any other settings in it.

To optimize the above a bit, you should actually create a new container, fill it, and add it to the table; this gets rid of a LOT of internal Table events that you don’t need when filling the table for the first time. Like this:

private void fillTable(){
  Container c= new IndexedContainer();
  // init container properties
  // fetch data
  // fill the container
  table.setContainerDataSource(c);
}

This will delay filling of the Table to the last possible moment.

3

Somewhat irrelevant but I noticed that you call requestRepaint. You should never have to call that method by hand. It shouldn’t affect anything, and if it does, then you have probably found a bug.

4

Thanks for the suggestion Thomas it works.

@Jens Jansson: I was just trying to get it work by putting in repaint(). Everything work fine now !! Thanks